Glass-mold



WILLIAM BROOKE, OE JERSEY CITY, NEW JERSEY.

` GLASS-MOLD.

Speccaton of Letters Patent No. 11,515, dated August 15, 1854.

To all whom z't may concern Be it known that I, WILLIAM BROOKE, of Jersey Cit-y, in the county Yof Bergen and State of New J ersey, have invented certain new and useful Improvements in Molds for Forming Insulators and other Articles Composed of Glass; and I do hereby declare that the following is a full and exact description thereof, reference being had to the annexed drawings, forming partof this specification, in Which p Figure 1 is a sidesectional view of my improved mold; Fig. 2, bottom view of plunger; Fig. 3, vertical vievv of bottom plate; Fig. 4:, bottom vieyv of mold cap; Fig. 5, view of perforated insulator; Fig. 6, bottom vieiv of insulator; Fig. 7 view of impressed cap.

a, mold for the glass; a', hinges; b, nailholder; b, hinges; o, hook for sustaining telegraph Wire; cZ,`handles of hook-holder;

6, lhandles of glass mold; f,`bottom plate of shoulder; g, cap plate; g` shoulder on cap plate; L, plunger; z', glass insulator; z' la, perforations in the same, la prongs on nail holder; 7s, perforators.

In using 'my improvements the telegraph hook c, is put Within the hook holder b, and the latter placed inside the mold a, in

`order to cast the glass and hook together in the usual'manner.` The hook-holder is closed by means of its handles, CZ, and the mold is shut by means of its handles e. After the mold is closed it is set upon the bottom-plate, f, `Within the shoulder, f', which effectually prevents Athe mold from opening during the operation of compress-` ing the glass. i The hook, o, having been placed Within its holder, Z9, and the latter placed Within the mold, a, the mold, a, is

. now ready for the reception of the glass metal. The operator cutsoff such a` quantity of the metal as he judges Will be sulficient to form an insulator, z', and drops it into the mold. The cap, g, is then laid on and the plunger, It, brought down by means of a press, whereby a proper degree of force is applied to the glass metal, which causes the glass to fillup the cavities of the mold "provided the operator has previously placed a sutlicient quantity of glass metal Within Witnesses n .upon the glass, causes the latter to fill up every crevice of the mold. If the operator did not put enough of glass into the mold to form the insulator solid, by the use of my improved cap, g, the plunger, h, forces the glass to assume, on its exterior, the exact dimensions of the mold, though the interior or middle parts of the insulator Would not be quite lled out, Which is a matter of no consequence, itbeing desirable to produce the insulators with their exterior lengths and diameter all of exact sizes. By the use of the old cap it Was a matter almost of impossibility to turn out insulators all of the exact exterior sizes. Some of them Will be longer or shorter than the others.

The great advantage of having a shoulder, g', screwing into the cap-piece, g, Will Having thus described my invention I claim- The shoulder, g', when used in combina- WILLIAM BROOKE.

YD. C. HITCHCOCK, i A.` E, BEACH, 

